| Ferromagnetic tendency at the surface of CE-type charge-ordered manganites |
| S. Dong; R. Yu; S. Yunoki; J. M. Liu; E. Dagotto
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| 2008
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| 发表期刊 | Physical Review B
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| ISSN | 1098-0121
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| 卷号 | 78期号:6 |
| 摘要 | Most previous investigations have shown that the surface of a ferromagnetic material may have antiferromagnetic tendencies. However, experimentally, the opposite effect has been recently observed-ferromagnetism appears in some nanosized manganites with a composition such that the antiferromagnetic charge-ordered CE state is observed in the bulk. A possible origin is the development of ferromagnetic correlations at the surface of these small systems. To clarify these puzzling experimental observations, we have studied the two-orbital double-exchange model near half doping, n = 0.5, using open boundary conditions to simulate the surface of either bulk or nanosized manganites. Considering the enhancement of surface charge density due to a possible AO termination (A = trivalent/divalent ion composite, O = oxygen), an unexpected surface phase-separated state emerges when the model is studied using Monte Carlo techniques on small clusters. This tendency suppresses the CE charge ordering and produces a weak ferromagnetic signal that could explain the experimental observations. |
| 部门归属 | [dong, shuai; yu, rong; yunoki, seiji; dagotto, elbio] univ tennessee, dept phys & astron, knoxville, tn 37996 usa. [dong, shuai; yu, rong; yunoki, seiji; dagotto, elbio] oak ridge natl lab, mat sci & technol div, oak ridge, tn 37831 usa. [dong, shuai; liu, j. -m.] nanjing univ, nanjing natl lab microstruct, nanjing 210093, peoples r china. [liu, j. -m.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;dong, s (reprint author), univ tennessee, dept phys & astron, knoxville, tn 37996 usa
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| 关键词 | Double-exchange Model
Magnetic-properties
Doped Manganites
Phase-diagram
Low-temperature
States
La2/3sr1/3mno3
Nanoparticles
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| URL | 查看原文
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| WOS记录号 | WOS:000259264900063
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/32720
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
S. Dong,R. Yu,S. Yunoki,et al. Ferromagnetic tendency at the surface of CE-type charge-ordered manganites[J]. Physical Review B,2008,78(6).
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| APA |
S. Dong,R. Yu,S. Yunoki,J. M. Liu,&E. Dagotto.(2008).Ferromagnetic tendency at the surface of CE-type charge-ordered manganites.Physical Review B,78(6).
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| MLA |
S. Dong,et al."Ferromagnetic tendency at the surface of CE-type charge-ordered manganites".Physical Review B 78.6(2008).
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